Read Sony HT-ST3 Service Manual online
HT-ST3
4
SECTION 1
SERVICING NOTES
UNLEADED SOLDER
Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
Boards requiring use of unleaded solder are printed with the lead-
free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size)
: LEAD FREE MARK
Unleaded solder has the following characteristics.
• Unleaded solder melts at a temperature about 40 °C higher
• Unleaded solder melts at a temperature about 40 °C higher
than ordinary solder.
Ordinary soldering irons can be used but the iron tip has to be
applied to the solder joint for a slightly longer time.
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350 °C.
Caution: The printed pattern (copper foil) may peel away if
about 350 °C.
Caution: The printed pattern (copper foil) may peel away if
the heated tip is applied for too long, so be careful!
• Strong
viscosity
Unleaded solder is more viscous (sticky, less prone to fl ow)
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.
than ordinary solder so use caution not to let solder bridges
occur such as on IC pins, etc.
•
Usable with ordinary solder
It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.
also be added to ordinary solder.
ADVANCE PREPARATION WHEN CONFIRMING OP-
ERATION
All of the units included in the HT-ST3 (SA-WST3/SS-ST3) are
required to confi rming operation of SA-WST3. Check in advance
that you have all of the units.
ERATION
All of the units included in the HT-ST3 (SA-WST3/SS-ST3) are
required to confi rming operation of SA-WST3. Check in advance
that you have all of the units.
NOTE OF PERFORMING THE OPERATION CHECK IN
THE STATE THAT HEAT SINK WAS REMOVED
When performing the operation check in the state that this unit was
disassembled, it is possible to perform the operation check in the
state that heat sink was removed. But don’t perform the operation
check in the long time, and perform the operation check in the
volume state as low as possible.
THE STATE THAT HEAT SINK WAS REMOVED
When performing the operation check in the state that this unit was
disassembled, it is possible to perform the operation check in the
state that heat sink was removed. But don’t perform the operation
check in the long time, and perform the operation check in the
volume state as low as possible.
NOTE OF REPLACING THE IC3506 ON THE AMP BOARD
IC3506 on the AMP board cannot exchange with single. When this
part is damaged, exchange the complete mounted board.
IC3506 on the AMP board cannot exchange with single. When this
part is damaged, exchange the complete mounted board.
NOTE OF REPLACING THE IC3005 AND IC3007 ON
THE AMP BOARD AND THE COMPLETE AMP BOARD
When IC3005 and IC3007 on the AMP board and the complete
AMP board are replaced, it is necessary to spread the compound
between the AMP board and the heat sink.
Spread the compound (THERMAL COMPOUND (G747)) refer-
ring to the fi gure below.
THE AMP BOARD AND THE COMPLETE AMP BOARD
When IC3005 and IC3007 on the AMP board and the complete
AMP board are replaced, it is necessary to spread the compound
between the AMP board and the heat sink.
Spread the compound (THERMAL COMPOUND (G747)) refer-
ring to the fi gure below.
– AMP Board (Component Side) –
thermal compound (G747)
IC3007
IC3005
CAPACITOR ELECTRICAL DISCHARGE PROCESSING
When checking the board, for the electric shock prevention, con-
nect the resistors to both ends of respective capacitor (C519) to
discharge the capacitor (C519).
When checking the board, for the electric shock prevention, con-
nect the resistors to both ends of respective capacitor (C519) to
discharge the capacitor (C519).
C519
– POWER Board (Conductor Side) –
800
:/2 W
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